Type-II Quantum-Dot-Sensitized Solar Cell Spanning the Visible and Near-Infrared Spectrum

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Department of Physics of Complex Systems, Weizmann Institute of Science, Rehovot 76100, Israel
State Key Laboratory of New Ceramics & Fine Processing, Department of Material Science and Engineering, Tsinghua University, Beijing 100084, P.R. China
§ Institute of Nanotechnology and Advanced Materials, Bar Ilan University, Ramat-Gan, 52900, Israel
*E-mail: [email protected]; Tel: +972-8-9346282; Fax: +972-8-9344109 (D.O.). E-mail: [email protected]; Tel: 86-10-627772672; Fax: 86-10-62772672 (H.L.).
Cite this: J. Phys. Chem. C 2013, 117, 43, 22203–22210
Publication Date (Web):December 20, 2012
https://doi.org/10.1021/jp312190x
Copyright © 2012 American Chemical Society
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Abstract

Type-II heterostructure CdTe/CdSe core/shell nanocrystals (quantum dots, QDs) are explored as sensitizers in a QD-sensitized photoelectrochemical solar cell. These QDs comprise a hole-localizing core and an electron-localizing shell. Among their advantages is the significant red shift of the absorption edge of the heterostructured QD relative to its two constituents due to spatially indirect absorption leading to improved absorption characteristics, intraparticle exciton dissociation upon photoexcitation, and a relatively small content of the less abundant tellurium element. Upon incorporation in a sensitized solar cell utilizing a porous TiO2 and a polysulfide electrolyte, these QDs exhibited efficient charge separation and high internal quantum efficiency despite hole localization in the CdTe core. Monochromatic incident photon-to-current conversion efficiency (IPCE) measurement shows a spectrally broad photoresponse spanning the whole visible spectrum and reaching up to ∼900 nm.

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Absorption cross section measurement, EIS analysis about the effect of ZnS film thickness on photovoltaic performance, corrections of the absorbance spectra, elemental mapping of the sensitized electrode, and their photographs. This material is available free of charge via the Internet at http://pubs.acs.org.

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